void SelectIndexCentered(int bestIndex)
{
if (bestIndex < 0)
{
listBox.ClearSelection();
}
else
{
int firstItem = listBox.FirstVisibleItem;
if (bestIndex < firstItem || firstItem + listBox.VisibleItemCount <= bestIndex)
{
// CenterViewOn does nothing as CompletionListBox.ScrollViewer is null
listBox.CenterViewOn(bestIndex);
listBox.SelectIndex(bestIndex);
}
else
{
listBox.SelectIndex(bestIndex);
}
}
}
/// <summary>
/// Selects the item that starts with the specified text.
/// </summary>
public void SelectItemWithStart(string startText)
{
if (string.IsNullOrEmpty(startText))
{
return;
}
if (listBox == null)
{
ApplyTemplate();
}
int selectedItem = listBox.SelectedIndex;
int bestIndex = -1;
int bestQuality = -1;
// Qualities: 0 = match start
// 1 = match start case sensitive
// 2 = full match
// 3 = full match case sensitive
double bestPriority = 0;
for (int i = 0; i < completionData.Count; ++i)
{
string itemText = completionData[i].Text;
if (itemText.StartsWith(startText, StringComparison.OrdinalIgnoreCase))
{
double priority = 0; //completionData[i].Priority;
int quality;
if (string.Equals(itemText, startText, StringComparison.OrdinalIgnoreCase))
{
if (startText == itemText)
{
quality = 3;
}
else
{
quality = 2;
}
}
else if (itemText.StartsWith(startText, StringComparison.Ordinal))
{
quality = 1;
}
else
{
quality = 0;
}
bool useThisItem;
if (bestQuality < quality)
{
useThisItem = true;
}
else
{
if (bestIndex == selectedItem)
{
useThisItem = false;
}
else if (i == selectedItem)
{
useThisItem = bestQuality == quality;
}
else
{
useThisItem = bestQuality == quality && bestPriority < priority;
}
}
if (useThisItem)
{
bestIndex = i;
bestPriority = priority;
bestQuality = quality;
}
}
}
if (bestIndex < 0)
{
listBox.ClearSelection();
}
else
{
int firstItem = listBox.FirstVisibleItem;
if (bestIndex < firstItem || firstItem + listBox.VisibleItemCount <= bestIndex)
{
listBox.CenterViewOn(bestIndex);
listBox.SelectIndex(bestIndex);
}
else
{
listBox.SelectIndex(bestIndex);
}
}
}
